<span xml:space="default">
            <!-- Always preserve CDATA whitespace -->
                   
        </span><p xml:space="default"><!-- The u element has multiple text, whitespace, and element children.  The element children change xml:space. --><u xml:space="preserve"> Hello<u xml:space="default">  </u>  <u xml:space="default" />  <b>World </b>  </u></p>